A spatial-temporal method for early prediction of fatigue crack region and orientation in metallic cellular materials using in-situ infrared thermography (IRT)

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2024-12-01 DOI:10.1016/j.addlet.2024.100258

Tyler D. Smith , Chad Westover , Matthew D'Souza , Shenghan Guo , Dhruv Bhate

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引用次数: 0

Abstract

This study seeks an early prediction method of crack failure location and orientation due to low cycle fatigue in additively manufactured metallic cellular materials by leveraging experimentally observed accumulation of plastic deformation. To study this, a novel spatial-temporal approach for analyzing Infrared Thermographic (IRT) video was developed to detect heat generated by local plastic deformation. The method was validated experimentally by conducting fully reversed low cycle fatigue tests of Inconel 718 (IN718) honeycomb specimens manufactured using Laser Powder Bed Fusion (LPBF). Using the approach developed, results showed that localized heating due to plastic work could be detected and used for early prediction of the most probable path, and orientation of crack propagation. Furthermore, the method developed was found to be able to predict these results within the first 1.5 % of the total life of the specimen apriori to crack initiation.

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基于原位红外热成像（IRT）的金属胞状材料疲劳裂纹区域和取向的时空早期预测方法

本研究利用实验观察到的塑性变形积累，寻求增材制造金属胞状材料低周疲劳裂纹失效位置和方向的早期预测方法。为了研究这一点，开发了一种用于分析红外热像仪（IRT）视频的新型时空方法，以检测局部塑性变形产生的热量。通过对激光粉末床熔化（LPBF）制备的Inconel 718 （IN718）蜂窝试样进行全反向低周疲劳试验，验证了该方法的有效性。利用所开发的方法，结果表明，塑性工作引起的局部加热可以被检测到，并用于早期预测最可能的路径和裂纹扩展方向。此外，所开发的方法被发现能够在试样总寿命的前1.5%内预测这些结果，而不是裂纹起裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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